Citation:
Jiajie Cai, Chang Cheng, Bowen Liu, Jianjun Zhang, Chuanjia Jiang, Bei Cheng. CdS/DBTSO-BDTO S型异质结光催化制氢及其电荷转移动力学[J]. Acta Physico-Chimica Sinica,
;2025, 41(8): 100084.
doi:
10.1016/j.actphy.2025.100084
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光催化分解水产氢具有广阔的应用前景。然而,单一光催化剂由于光生电子与空穴易复合,导致光催化产氢效率较低,严重制约了该技术的实际应用。构建异质结是克服这些缺点的有效策略,最近S型异质结脱颖而出,显示出了高效的促进电子和空穴分离的能力,同时最大限度地提高光催化剂的氧化还原能力。其中,基于聚合物的S型光催化剂正在兴起,但无机-有机S型异质结中的载流子动力学仍有待阐明。在本工作中,我们制备了由共轭聚合物双氧硫芴苯并二噻吩二酮(dibenzothiophene-S,S-dioxide-alt-benzodithiophene, DBTSO-BDTO)和硫化镉(CdS)组成的S型异质结,并研究了其光催化制氢的性能和界面电荷传输机制。利用原位辐照X射线光电子能谱验证了S型电子转移机理,并利用飞秒瞬态吸收光谱深入分析了S型异质结中载流子的动力学,证实有大量光生电子发生了界面电荷转移。由于S型异质结对载流子效率的提高和氧化还原能力的增强,复合材料的性能超过了DBTSO-BDTO和CdS,并且最优化复合材料的析氢速率达到3313 μmol·h-1·g-1,约为纯CdS的3倍。本工作为S型异质结的电子转移机制提供了新的视角,并可指导用于太阳能燃料生产的聚合物基光催化剂的开发。
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